摘要
[目的]研究橘梗(Platycodon grandiflorum A.DC)光合作用日变化特征,为其生产栽培提供参考。[方法]采用Li-6400便携式光合作用测定系统测定一天中不同时间段橘梗的光合速率、蒸腾速率、气孔导度、胞间CO2浓度及光合有效辐射强度,并对其光响应曲线进行拟合。[结果]橘梗的光合速率日变化趋势呈双峰曲线,有明显的"午休"现象;相关分析结果表明,橘梗光合速率中午降低是气孔限制因素导致的;橘梗的光饱和点为1 418μmol/(m2.s),光补偿点为68μmols/(m2.s),表观量子效率为0.067 7。[结论]橘梗属于阴生植物,对弱光的利用能力较强。
[Objective] To study the diurnal variation of photosynthesis of P.grandiflorum A.DC,in order to provide references for its cultivation.[Method]By using LI-6400 portable photosynthesis system,the photosynthetic rate,transpiration rate,stomatal conductance,intercellular CO2 concentration and photosynthetic active radiation of P.grandiflorum A.DC at different time periods of a daywere detected,and its photoresponse curve was fitted.[Result]The diurnal variation of photosynthetic rate showed a two-peaked curve and an obvious ＂noon-break＂;as indicated by the correlation analysis result,the noon decrease of photosynthetic rate was caused by the stomata factors;the light saturation point was 1 418 μmol/（m2·s）,the light compensation point was 68 μmol/（m2·s） and the apparent quantum efficiency was 0.067 7.[Conclusion]P.grandiflorum A.DC was shade plant,and it had strong ability to use low light.
出处
《安徽农业科学》
CAS
北大核心
2011年第27期16563-16565,共3页
Journal of Anhui Agricultural Sciences
基金
陕西省自然科学基金项目(2010JQ3007)
商洛市政府科技计划项目(09skj001)
商洛学院博士启动基金项目(09sky024)
关键词
橘梗
光合有效辐射
光合速率
P.grandiflorum A.DC
Photosynthetic active radiation（PAR）
Net photosynthetic rate（Pn）
